Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
21597 (1998 WA8)
Classification: Main-belt Asteroid          SPK-ID: 2021597
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07403506682026155 7.1062e-08  
a 3.018376278054941 3.8621e-08 AU
q 2.794910588620451 2.0526e-07 AU
i 11.25673945130105 9.2138e-06 deg
node 60.08906541178841 3.9097e-05 deg
peri 231.65638029525 8.1274e-05 deg
M 142.8534484452444 7.2009e-05 deg
tp 2456240.442019815788
(2012-Nov-08.94201982)
0.0003837 JED
period 1915.395643887414
5.24
3.6762e-05
1.006e-07
d
yr
n .1879507250362946 3.6073e-09 deg/d
Q 3.241841967489431 4.148e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      843  
   data-arc span      6826 days (18.69 yr)  
   first obs. used      1996-05-16  
   last obs. used      2015-01-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50738  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 14:00:01  

Additional Information
 Earth MOID = 1.79613 AU 
 T_jup = 3.214 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2 mag n/a MPO266069  

21597 (1998 WA8)          Discovered 1998-Nov-18 by Ueda, S., Kaneda, H. at Kushiro (399)
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2015-Mar-04 15:17 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin